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Subject[PATCH v2 00/31] Don't use stack for DMA transers on media usb drivers
Sending URB control messages from stack was never supported. Yet, on x86,
the stack was usually at a memory region that allows DMA transfer.

So, several drivers got it wrong. On Kernel 4.9, if VMAP_STACK=y, none of
those drivers will work, as the stack won't be on a DMA-able area anymore.

So, fix the media drivers that requre it. It should noticed that the vast
majority are at dvb-usb.

Please notice that those patches are compile-tested only. So, I really
appreciate if people with devices using those drivers could test and
report if they don't break anything. I intend to send this

PS.: I didn't verify any media driver inside staging.

Version 2:

- Added other USB drivers that are out of dvb-usb. After this series, all
drivers will use kmalloc'ed buffers, although I won't doubt that some
implementations may still have issues.

- Be sure that, on all places where it is using a buffer allocated at the
dvb-usb state structs, they'll be protected by some mutex. On some
such cases, there was already a mutex at the DVB core. So, I didn't
need to add a new one. Thanks to Antti that reminded me about such

Mauro Carvalho Chehab (31):
af9005: don't do DMA on stack
cinergyT2-core: don't do DMA on stack
cinergyT2-core: handle error code on RC query
cinergyT2-fe: cache stats at cinergyt2_fe_read_status()
cinergyT2-fe: don't do DMA on stack
cxusb: don't do DMA on stack
dib0700: be sure that dib0700_ctrl_rd() users can do DMA
dib0700_core: don't use stack on I2C reads
dibusb: don't do DMA on stack
dibusb: handle error code on RC query
digitv: don't do DMA on stack
dtt200u-fe: don't keep waiting for lock at set_frontend()
dtt200u-fe: don't do DMA on stack
dtt200u-fe: handle errors on USB control messages
dtt200u: don't do DMA on stack
dtt200u: handle USB control message errors
dtv5100: don't do DMA on stack
gp8psk: don't do DMA on stack
gp8psk: don't go past the buffer size
nova-t-usb2: don't do DMA on stack
pctv452e: don't do DMA on stack
pctv452e: don't call BUG_ON() on non-fatal error
technisat-usb2: use DMA buffers for I2C transfers
dvb-usb: warn if return value for USB read/write routines is not
nova-t-usb2: handle error code on RC query
dw2102: return error if su3000_power_ctrl() fails
digitv: handle error code on RC query
cpia2_usb: don't use stack for DMA
s2255drv: don't use stack for DMA
stk-webcam: don't use stack for DMA
flexcop-usb: don't use stack for DMA

drivers/media/usb/b2c2/flexcop-usb.c | 105 +++++----
drivers/media/usb/b2c2/flexcop-usb.h | 4 +
drivers/media/usb/cpia2/cpia2_usb.c | 32 ++-
drivers/media/usb/dvb-usb/af9005.c | 317 ++++++++++++++++------------
drivers/media/usb/dvb-usb/cinergyT2-core.c | 90 +++++---
drivers/media/usb/dvb-usb/cinergyT2-fe.c | 100 ++++-----
drivers/media/usb/dvb-usb/cxusb.c | 62 +++---
drivers/media/usb/dvb-usb/cxusb.h | 6 +
drivers/media/usb/dvb-usb/dib0700_core.c | 31 ++-
drivers/media/usb/dvb-usb/dib0700_devices.c | 25 +--
drivers/media/usb/dvb-usb/dibusb-common.c | 113 +++++++---
drivers/media/usb/dvb-usb/dibusb.h | 3 +
drivers/media/usb/dvb-usb/digitv.c | 26 ++-
drivers/media/usb/dvb-usb/digitv.h | 3 +
drivers/media/usb/dvb-usb/dtt200u-fe.c | 128 +++++++----
drivers/media/usb/dvb-usb/dtt200u.c | 120 ++++++++---
drivers/media/usb/dvb-usb/dtv5100.c | 10 +-
drivers/media/usb/dvb-usb/dvb-usb.h | 6 +-
drivers/media/usb/dvb-usb/dw2102.c | 2 +-
drivers/media/usb/dvb-usb/gp8psk.c | 25 ++-
drivers/media/usb/dvb-usb/nova-t-usb2.c | 25 ++-
drivers/media/usb/dvb-usb/pctv452e.c | 136 +++++++-----
drivers/media/usb/dvb-usb/technisat-usb2.c | 16 +-
drivers/media/usb/s2255/s2255drv.c | 15 +-
drivers/media/usb/stkwebcam/stk-webcam.c | 16 +-
25 files changed, 918 insertions(+), 498 deletions(-)


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